GitHub user wzhfy opened a pull request: https://github.com/apache/spark/pull/16631
[SPARK-19271] [SQL] Change non-cbo estimation of aggregate ## What changes were proposed in this pull request? Change non-cbo estimation behavior of aggregate: If groupExpression is empty, we can know row count (=1) and the corresponding size; otherwise, estimation falls back to UnaryNode's computeStats method, which should not propagate rowCount and attributeStats in Statistics because they are not estimated in that method. ## How was this patch tested? Added test case You can merge this pull request into a Git repository by running: $ git pull https://github.com/wzhfy/spark aggNoCbo Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/16631.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #16631 ---- commit 0c64316bcd638e9b1a3ba5c990c669be6231c3c4 Author: wangzhenhua <wangzhen...@huawei.com> Date: 2017-01-18T08:01:58Z non cbo estimation for agg ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org